from combinations import Solution


def test1():
    res = Solution().combine(4, 2)
    assert res == [[1, 2], [1, 3], [1, 4], [2, 3], [2, 4], [3, 4]]

def test2():
    res = Solution().combine(4,4)
    assert res == [[1,2,3,4]]


def test_empty():
    res = Solution().combine(0 ,0)
    assert res == []

def test_time():
    res = Solution().combine(100,4)
